There are different culture, different beliefs, different views that make everything in a comfort zone. Once the people in the country are contented and comfortable by what they already have they wouldn't look for something because they seems have everything. Some countries doesn't want bitcoin because the people of the nation doesn't have enough living for everyday live and they can't afford to provide their daily needs. There are different reasons why all countries did not make bitcoin as legal. The barriers is limitations and capacity and ability on the people to adopt.